4. E - Fixed Constructions
  5. 21
  6. B

Well devices

E - Fixed Constructions – 21 – B

Patent

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166/67

E21B 33/128 (2006.01)

Patent

CA 654712

Fredd John V.

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Na

G - Physics – 21 – G
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Otis Engineering Corporation

E - Fixed Constructions – 21 – B
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